Thread-cutting attachment for sewing-machines.



R. L. COLBY. THREAD CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLIOATIOIT IIL'ED JUNE 15. 1912.

Patented Dec. 17, 1912.

11047 887. ZSHEBTB-SEEET 1.

R. L. COLBY. A THREAD CUTTING ATTACHMENT FOR SEWING MAGHINES.

APPLICATION FILED JUNE 15, 1912.

' Patented Dec. 17, 1912.

' IVESSES Arron/157s 'UNITED STATES PATENT onmcn.

ROBERT LEE COLEY, OF KANNAPOLIS, NORTH CAROLINA, ASSIGNOB OF ONE-ml TO YTAKES W. CANNON, OF CONCORD, NOB'IH CAROLINA,

THREAD-CUTTING ATTACHHEM FOB SEWTNG MA Specification of- Letters PatentI Patented Dec} Applieatlon flled June 15, 1912. Serial no, masts.

To all whom it may concern: 1 v Be it known that I, ROBERT LEE Comer, a

, citizen of the United States, and a resident second article being fedas the first is finof Karma olis, in the county of Cabarrus, State oforth Carolina, have invented a new and useful Improvement in Thread-Cutting Attachments for Sewing-Machines, of which the following is aspecification.

My invention is an lmprovement in thread -cutting attachments for sewingmachines, and has for its object the provision of a simple attachment ofthe character specified, capable of attachment to any form of machinewith but little change, and for automatically cutting the thread betweenarticles without stopping the machine'and without injuring the artlcle.

In the drawings: Figure 1 is a side view of a portion of a sewin machineprovided with the attachment; Fig. 2 is a top plan view of the doublefeed plate; Fig. 3 is a section on the line 33 of Fig. 1; Fig. 4 is a"section on the line 44 of Fig. 3;:Fig. 5 is an enlarged detail end viewof thepresser feet and the feed plates; Fig.6 is a perspective view ofthe presser feet; Fig. 7 1s a perspective view'of the supportingmechanism for the blade, and Fig. 8 is a section on the line 88 of Fig.4.-

With power machines, as also with hand operated machines, the articlesare passed through the machine in close succession, a

ished, so that there will be no stoppage of the machine and no cessationin the attention of the operator. After the articles are sewed they mustbe separated by clipping the connecting thread. i The present inventionis designed to cut the thread between the articles automatically and asthey are finished.

- The present embodiment of the invention is'shown in place on a sewingmachine, and comprises a double foot, consisting of a socket 1, which isslipped over the end of the presser bar 2 of the machine in the usualmanner and held in place by a set-screw 3.

e feeding mechanism of the machine, and another feed plate 6" extendsfrom the shank in' the opposite direction from plate '6. The shank 7 hasan openin ,9 for receiving a screw (not shown) to hold the platesin-place, and the double feed is operated in exactly, the same manner asthe ordinary feed. ,The plate 6 cooperates with presser foot 5, whileplate 6 cooperates with presser'foot 5". An arm 11'-is provided at itsends with bearings 12 and 12, the former engaging the needle bar 13 andthe latter receiving one end of a rod 14. A set-screw 15 is passedthrough bearing12 and engages the needle bar to hold the arm in(P08111011,

and a head 16 is pinned to the lower end of. the rod, as indicated at17. A spring 18 encircles the rod above the head for a p ose to bedescribed, and the head has spaced ugs on its under face engagingopposite sides of a plate 19. A washer 20 encircles the rod -above"thebearing 12, and nuts 21 are threaded onto the rod above the washer.

The plate 19 is mounted to slide vertically on a holding plate 22,secured'tothe frame. 23 of the machine by a screw 24. The plate 19 hasalined longitudinal slots 25, one near 'each end, and screws,26 arepassed through I the slots and engage the plate 22. A plate spring 27 isarranged onthe opposite face of plate 1 9- from the plate 22, and thescrews 26 pass through the sprin and hold it agalnst plate 19. The ends0 the spring are curved outwardly, as shown at 28, to prevent cutting ofplate 19. A blade 29 extends lat erally from'the upper end of plate 19,and a bar-30 is secured to the blade and plate by screws 31. The lugs ofthe head embrace both the bar and the upper end of plate 19 and theblade 29 moves vertically with the plate 19, the said plate slidinbetween plate 22 and spring 27. The movaile blade 006perates wlth aledger or fixed blade 32 extending laterally from the upper 7 end ofplate 22, and the said blades 29 and 32 extend transversely of thestitches it is formed by the needle. The bar 30 extends on the oppositeside of the plate 19 from the blades,

and the opposite end from the blades is bent laterally downward, asshown at 33, and. provided with a button or circ'ularl late or head 34.A second button plate or ead 35 is arranged below the table 36 inregister I j the arm in adjusted position on the bar, a rod in the otherbearing, a nut on the rod a plate spring 37 by means of a screw 38,

and the opposite end of the spring 37 is se- 1 cured to the under faceof the table by screws 40. A disk 41 of rubber or the like is placed onthe upper face of head 35 in the opening 39, the heads and disk forminga protecting device for the cloth.

The operation of the im rovement is as follows: The articles are edthrou h the vmachine-in succession, each article ollow-' ing theprecedin closely, and the 'stitch or threads connect t e articles. Thethread between the articles is held taut by the auxiliar feed plate andpresser foot. The rod 14 is reciprocated continuously by the needle bar,and the movable blade moves toward the fixed blade at every downwardmovement of the needle bar. As long as an Jarticle is between the bladesthe movable blade 29 merely strikes on the upper face of the seam. Thespring 18 yields and permits the blade 29 to be held upwardly by thecloth. As soon as the article passes from between the blades the blade29 moves past the blade 32 and clips the threads. The heads or plates 34and 35 act as protectors for the cloth; When the needle bar moves down,the head or plate 34 strikes the cushion, that is, the disk 41, and thespring 37 which yields and prevents injury to the cloth from the blades.When the cloth is plate and a needle bar, of a.thread cuttingattachment, comprisin an auxiliary presser foot and an auxiliary eedplate coiiperatin therewith and arranged directly behind an in alinementwith the presser foot and feed plate of the machine, a plate arrangedvertically between the auxiliary presser foot and the presser foot ofthe machine and rovided with a laterally extending le ger bladeextending transversely of the stitch below the same, a plate mounted forsliding movement on the first plate and provided with a laterallyextending blade coiiperating with the ledger blade, an arm having abearing at each end, one of the bearings engaging the needle bar, meansfor securing above the arm, a head at the lower end of the rod, saidhead being connected to the sliding plate, a spring encircling the rodbetween the arm and the head, a bar extending laterally from the slidingplate, a resilient arm secured at one end to the machine and having itsfree end below the The auxiliary feed free end of the bar, disks on thefree ends of the arm and bar, and a cushion of rubber on the disk ofthearm.

2. The combination with asewing machine provided with a presser foot, afeed plate of" the machine, a plate arranged vertically between theauxil ary presser foot and the presser foot of the machine and rovidedwith a laterally extending le ger blade extending transversely of thestitch below the same, a plate mounted for sliding movement on the firstplate and provide with a laterall with the first blade, an arm having abearing at each end,.one of the bearings engaging the needle bar, meansfor securing the arm in adjusted position on the bar, a rod in the otherbearing, a nut on the rod above the arm, ahead at the lower end of therod, said head being connected to the sliding plate, a spring encirclingthe rod between the arm and the head, and a cushion for engagingthe'sliding plate as it nears the end of its downward movement.

3. The combination with a sewing machine provided with a presser foot, afeed plate and a needle bar, of a thread cutting attachment, comprisingan auxiliary presser foot and an auxiliary feed plate cooperatintherewith and arranged directly behind an in alinement with the presserfoot and feed plate of the machine, a plate arranged vertically betweenthe auxiliary presser foot and the presser foot of the machine-andprovided with a laterally extending ledger blade extending transverselyof the stitch extending blade codperating below the same, a platemounted for sliding movement on the first plate and provided with alaterally extending blade cooperating with the ledger blade, an armhaving a bearing at each end, one of the bearings engaging the needleban-means for securing the arm in adjusted position on the bar, a rod inthe other bearing, a nut on the rod above the arm, a head at the lowerend ofthe rod, said head being connected to the sliding plate, a springencirclingthe rod between the arm and the head, and means for cushioningthe downward'movement of the sliding plate. 1 I

4. The combination with a sewing machine provided with a presser. foot,a feed plate and a needle bar, of a thread cutting attachment,comprising an auxiliary presser foot and an auxiliary feed platecooperating therewith and arranged directly behind and in alinement withthe presser foot and feed plate of the machine, a plate arrangedvertically between the auxiliary .presser foot and the presser foot ofthe machine and pro- 5. The combination with a sewing ma- :hine providedwith a presser foot, a feed plate and a needle bar, of a thread cuttinglttachment comprising an auxiliary presser foot and an auxiliary 'feedplate'cooperating herewith and arranged directly behind and .n alinementwith-the presser foot and feed slate of the machine, a plate arrangedveriically between the auxiliary presser foot' and the presser foot ofthemachine .and provided with a' laterally extending ledger bladeextending transversely of the stitch at the level of the table of themachine, a plate mounted for sliding movement on the first plate andprovided with a laterally extending blade coiiperating with the ledgerblade, and a yielding connection between the sliding plate and theneedle bar for reciprocating the plate with the bar.

6. The combination with the sewing machine provided with a presser foot,a feed plate, a needle bar, and a needle, of a fixed blade extendingtransversely of the needle behind the same, a. movable blade cooperatingwith the fixed blade for severing the thread behind the needle, an arm.having means for adjustably engaging the needle bar, a rod connected atits lower end to the movable blade and slidably connected at-itsopposite end to the arm, a spring between the blade and the arm, meansfor cushioning the downward movement of the blade, said means comprisinga laterally extending bar connected to the rod, a resilient armconnected at one end to the machine and having its free end in positionfor engagement by the arm as the blade moves downwardly, a cushionbetween the arm and the bar, and an auxiliary feeding device for thearticles in rear of the needle.

7. The combination with the sewing machine provided with a presser foot,a feed plate, a needle bar, and a needle, of afixed blade extendingtransversely of the needle behind the same, a movable blade'cotiperatingwith the fixed blade for severing the thread behind the needle, an armhaving means for. adjustably engaging the needle bar, a rod connected atits lowerend to the movable blade and slidably connected at its oppositeend to the arm, a spring between the blade and the arm, means "forcushionin the downward movement of the blade, sai

means comprising a .laterally extending bar ,connected to the rod, aresilient arm connected at one end to the machine and having its freeend in position for engagement by the arm as the blade moves downwardly,and an auxiliary feeding device for the articles in rear of the needle.

8. The combination with the sewing machine provided with a presser foot,a feed plate, a needle bar, and a needle, oia fixed blade extendingtransversely of the needle behind the same, a .movable bladecooperatingwith the fixed blade for severing the thread behind the needle, an armhaving means for adjustably engaging the needle bar, a rod connected atits lower end to the movable blade and slidably connected at itsopposite end to the arm, a spring between the blade and the arm, meansfor cushioning the downward movement of the blade, and an auxiliaryfeeding device for the articles in rear of the needle.

9." 'The combination with the sewing machine provided with a presserfoot, a feed plate, a needle bar, and a needle, of a fixed bladeextending transversely of the needle behind the same, a movable bladecooperating with the fixed blade for severing the thread behind theneedle, a yielding connection between the movable blade and the needlebarfor reciprocating the blade with. the bar, means'for cushioning thedownward movement of the blade, said means comprising a laterallyextending bar com nected'to the rod, a resilient arm connected at oneend to the machine and having its free end in position for engagement bythe arm as the blade moves downwardly, a cushion between the arm and thebar, and an auxiliary feeding device for the articles in rear of .theneedle.

10. The combination with the sewing ma-.

chine provided with a presser foot, a feed plate, 'a needle bar, and aneedle, of a fixed blade extending transversely of the needle behind thesame, a movable blade cotiperating with the fixed blade for severing thethread behind the needle, a yielding connection between the movableblade and the needle .bar for reciprocating the blade with the bar, andan auxiliary feeding device in rear of the needle.

ROBERT LEE COLEY. Witnesses: v

E. C. ANDREWS, O. E. ScARBoRo.

